8.5 degrees is almost as low as you can go in a Titleist head (7.5 possible but 8.5 is already a little low). If you want to get a little less spin, look at the ProLaunch Red, Diamana Whiteboard or Aldila VS Proto. These should cut the spin down significantly compared to the YS shaft you have now and they will probably launch quite a bit lower. I wouldn't tell you to put any of them in your driver though without getting fitted on a LM. I know that I tried lots of different shafts in my old Titleist 905R without getting fitted and I spent way too much and got nothing out of it. Once I got fitted, I picked p yards and find more fairways (I use the PL Red because I was getting too much spin and too high of a launch.) Just my thoughts, but I would say get fitted and go from there.